Electrical Distribution Systems
Mostrando 25-36 de 68 artigos, teses e dissertações.
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25. Development of a methodology for identification of cardiac region in images of electrical impedance tomography of pulmonary perfusion by means of wavelet transform / Desenvolvimento de uma metodologia para identificação de região cardíaca em imagens de tomografia de impedância elétrica de perfusão pulmonar por meio da transformada wavelet
Electrical Impedance Tomography (EIT) is an imaging technique, still in development, which allows imaging of the distribution of conductivity in a cross section of an object under analysis from electrical measures made on its surface. Despite its benefits and advantages over other imaging techniques, its images still do not offer a good spatial resolution. O
Publicado em: 2009
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26. "Afundamentos de tensão no contexto da expansão dos sistemas elétricos: proposta de índices considerando dados do sistema de detecção de descargas atmosféricas"
The impact of voltage sags to power utilities and consumers has been remarking this event as a relevant phenomenon to address in power system studies. It is considered one of the most frequent sources of power-supply interruption and malfunction on several types of equipment, resulting in power-quality degradation. Nowadays, voltage sag has been basically ad
Publicado em: 2009
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27. ELECTRIC DISTRIBUTION POWER SYSTEMS RELIABILITY OPTIMIZATION: An Approach Considering the Selection and Allocation of Protection and Switching Devices / OTIMIZAÇÃO DA CONFIABILIDADE DE SISTEMAS DE DISTRIBUIÇÃO DE ENERGIA ELÉTRICA: Uma Abordagem Considerando a Seleção e Alocação de Dispositivos de Proteção e Manobras
One of the main goals of the electric utilities is to provide energy to its customers in a reliable and low cost way. Traditionally, the electricity sector regulatory commissions impose continuity targets, which must be carried out, to avoid great penalties. For many years, the electric utilities have adopted the practice of allowing the increment of tempora
Publicado em: 2009
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28. Distribuição vertical e sazonal da comunidade fitoplanctônica em dois reservatórios eutróficos do Estado de Pernambuco
The dynamics of the phytoplankton community in aquatic ecosystems provides considerable diagnostic information and serves as a sensitive tool for the indication of environmental changes, enabling the prediction of changes in any body of water. The vertical distribution of these organisms in eutrophic reservoirs remains an under-explored field of study, but i
Publicado em: 2009
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29. Uso de ferramentas de aprendizado de máquina para prospecção de perdas comerciais em distribuição de energia elétrica / Use of machine learning tools for prospecting commercial losses in electric energy distribution
As concessionárias de energia elétrica deixam de faturar anualmente expressivos valores devido a perdas comerciais, as quais são originadas principalmente por fraudes cometidas por parte dos consumidores e por medidores defeituosos. A detecção automática dos pontos específicos onde ocorrem tais perdas é uma tarefa complexa, dada a grande quantidade d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/01/2008
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30. Integração entre sistema de informação geográfica e sistema de projeto de redes de distribuição. / Integration between system of geographic information and system of project of distribution nets.
The information interchanges between management systems and others information systems of an electrical distribution company is not only desirable, but in most cases necessary. Due this necessity it was developed one research aiming to describe the integration methodologies between geographic information systems and electrical grid expansion designer systems
Publicado em: 2008
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31. Automação como recurso de planejamento de redes de distribuição de energia elétrica. / Automation as resource for distribution systems planning.
Concerning the components of an electrical distribution network and their susceptibility to functional failures or need for maintenance actions, planning and project criteria should be adopted to assure continuity of energy supply even though some components may be out of work. Traditionally the power systems, especially in power transmission and distributio
Publicado em: 2008
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32. Risco e confiabilidade sobre estruturas combinatÃrias : uma modelagem para redes elÃtricas
Reability of an component is the probability that it perform its functions under specific conditions. Unlike the concept of reliability is the concept of risk, which is defined as the probability of failure versus the cost associating with such failure. Mathematical models are often used in engineering projects and the analysis of reliability, robustness and
Publicado em: 2008
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33. Otimização dos custos de energia elétrica na programação do armazenamento e distribuição de água em redes urbanas / Minimization of the electrical energy cost in water distribution networks
The problem focused in this study consists of reducing the eletrical energy cost necessary to the operation of hydraulic pumps. The hydraulic pumps are used to catch water from artesians wells or Water Treatment Station to supply tanks which are located in districts in a city, from which the population will be supplied by gravitational force. As the cost of
Publicado em: 2008
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34. Feeders parallelism through vis-a-vis disconnecting switches in aerial primary distribution network. / Paralelismo de alimentadores através de seccionadoras de vis-à-vis na rede aérea primária de distribuição.
An important aspect related to the distribution systems operation concerns the safety required in the post-disturbances restorement actions or in the emergency and scheduled maneuvers, which involve the need for load transfer between primary overhead feeders of a same sub-station or for an adjacent sub-station, in a safe and reliable way, complying with the
Publicado em: 2008
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35. TÉCNICAS DE OTIMIZAÇÃO APLICADAS A SISTEMAS ELÉTRICOS DE DISTRIBUIÇÃO / APPLIED TECHNIQUES OF OPTIMIZATION ON ELECTRICAL DISTRIBUTION SYSTEMS
Este trabalho apresenta três técnicas para otimização de sistemas de distribuição de energia elétrica (SDE) utilizando-se fluxo de potência ótimo baseado na metodologia primal-dual de pontos interiores. O objetivo consiste em obter o mínimo de perdas de potência ativa nos alimentadores. As técnicas são baseadas em um algoritmo para reconfiguraç
Publicado em: 2008
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36. Caracterização físico-química de materiais baseados em celulose
Switching cutout devices are electrical circuit breakers which protect electric power distribution webs against lightning discharges. Switching cutout devices main parts are the fuse links in which a fuse element, a special metallic alloy, melts due to the generated heat when struck by electric discharges. When such melting occurs, and the breaker opens, an
Publicado em: 2008